Study on wireless power transmission using convergent ultrasound beam

• Project/Area Number: 15K12074
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Human interface and interaction
• Research Institution: The University of Tokyo
• Principal Investigator: Shinoda Hiroyuki 東京大学, 新領域創成科学研究科, 教授 (40226147)
• Project Period (FY): 2015-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: ワイヤレス電力伝送 / ヒューマンインタフェース / 超音波 / インタラクション

Outline of Final Research Achievements

In this study, we examined the feasibility of wireless power transmission in the air using convergent ultrasound beam. Since the ultrasound is reflected at the human skin surface, stronger ultrasound energy density is available near a human skin than the case of electromagnetic wireless power transmission. In this study, we experimentally confirmed that a 1cm-diamenter ultrasound transducer facing to an ultrasound phased array of 38 cm by 30 cm phased array could receive 0.15-0.65W in a parallel plane 20cm apart from the phased array. Next we realized a system that enabled power transmission to a moving target by keeping the ultrasound focus on it. We clarified the feasibility and limitation of the power transmission in the current available technologies.

Research Products

• [Presentation] 空中超音波による無線給電とその応用 (2015)
  • Author(s): 馬 少翔, 吉本 東天, 井上 碩, 長谷川 圭介, 牧野 泰才, 篠田 裕之
  • Organizer: 第16回計測自動制御学会システムインテグレーション部門講演会
  • Place of Presentation: 名古屋国際会議場 （愛知県名古屋市熱田区）
  • Year and Date: 2015-12-14